[PATCH v18 8/9] arch, mm: wire up memfd_secret system call where relevant
Mike Rapoport
rppt at kernel.org
Wed Mar 3 16:22:08 GMT 2021
From: Mike Rapoport <rppt at linux.ibm.com>
Wire up memfd_secret system call on architectures that define
ARCH_HAS_SET_DIRECT_MAP, namely arm64, risc-v and x86.
Signed-off-by: Mike Rapoport <rppt at linux.ibm.com>
Acked-by: Palmer Dabbelt <palmerdabbelt at google.com>
Acked-by: Arnd Bergmann <arnd at arndb.de>
Acked-by: Catalin Marinas <catalin.marinas at arm.com>
Cc: Alexander Viro <viro at zeniv.linux.org.uk>
Cc: Andy Lutomirski <luto at kernel.org>
Cc: Borislav Petkov <bp at alien8.de>
Cc: Christopher Lameter <cl at linux.com>
Cc: Dan Williams <dan.j.williams at intel.com>
Cc: Dave Hansen <dave.hansen at linux.intel.com>
Cc: David Hildenbrand <david at redhat.com>
Cc: Elena Reshetova <elena.reshetova at intel.com>
Cc: Hagen Paul Pfeifer <hagen at jauu.net>
Cc: "H. Peter Anvin" <hpa at zytor.com>
Cc: Ingo Molnar <mingo at redhat.com>
Cc: James Bottomley <jejb at linux.ibm.com>
Cc: "Kirill A. Shutemov" <kirill at shutemov.name>
Cc: Mark Rutland <mark.rutland at arm.com>
Cc: Matthew Wilcox <willy at infradead.org>
Cc: Michael Kerrisk <mtk.manpages at gmail.com>
Cc: Palmer Dabbelt <palmer at dabbelt.com>
Cc: Paul Walmsley <paul.walmsley at sifive.com>
Cc: Peter Zijlstra <peterz at infradead.org>
Cc: Rick Edgecombe <rick.p.edgecombe at intel.com>
Cc: Roman Gushchin <guro at fb.com>
Cc: Shakeel Butt <shakeelb at google.com>
Cc: Shuah Khan <shuah at kernel.org>
Cc: Thomas Gleixner <tglx at linutronix.de>
Cc: Tycho Andersen <tycho at tycho.ws>
Cc: Will Deacon <will at kernel.org>
---
arch/arm64/include/uapi/asm/unistd.h | 1 +
arch/riscv/include/asm/unistd.h | 1 +
arch/x86/entry/syscalls/syscall_32.tbl | 1 +
arch/x86/entry/syscalls/syscall_64.tbl | 1 +
include/linux/syscalls.h | 1 +
include/uapi/asm-generic/unistd.h | 6 +++++-
scripts/checksyscalls.sh | 4 ++++
7 files changed, 14 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/include/uapi/asm/unistd.h b/arch/arm64/include/uapi/asm/unistd.h
index f83a70e07df8..ce2ee8f1e361 100644
--- a/arch/arm64/include/uapi/asm/unistd.h
+++ b/arch/arm64/include/uapi/asm/unistd.h
@@ -20,5 +20,6 @@
#define __ARCH_WANT_SET_GET_RLIMIT
#define __ARCH_WANT_TIME32_SYSCALLS
#define __ARCH_WANT_SYS_CLONE3
+#define __ARCH_WANT_MEMFD_SECRET
#include <asm-generic/unistd.h>
diff --git a/arch/riscv/include/asm/unistd.h b/arch/riscv/include/asm/unistd.h
index 977ee6181dab..6c316093a1e5 100644
--- a/arch/riscv/include/asm/unistd.h
+++ b/arch/riscv/include/asm/unistd.h
@@ -9,6 +9,7 @@
*/
#define __ARCH_WANT_SYS_CLONE
+#define __ARCH_WANT_MEMFD_SECRET
#include <uapi/asm/unistd.h>
diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl
index a1c9f496fca6..34f04076a140 100644
--- a/arch/x86/entry/syscalls/syscall_32.tbl
+++ b/arch/x86/entry/syscalls/syscall_32.tbl
@@ -447,3 +447,4 @@
440 i386 process_madvise sys_process_madvise
441 i386 epoll_pwait2 sys_epoll_pwait2 compat_sys_epoll_pwait2
442 i386 mount_setattr sys_mount_setattr
+443 i386 memfd_secret sys_memfd_secret
diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl
index 7bf01cbe582f..bd3783edf27f 100644
--- a/arch/x86/entry/syscalls/syscall_64.tbl
+++ b/arch/x86/entry/syscalls/syscall_64.tbl
@@ -364,6 +364,7 @@
440 common process_madvise sys_process_madvise
441 common epoll_pwait2 sys_epoll_pwait2
442 common mount_setattr sys_mount_setattr
+443 common memfd_secret sys_memfd_secret
#
# Due to a historical design error, certain syscalls are numbered differently
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 2839dc9a7c01..4b87a2b3f442 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -1041,6 +1041,7 @@ asmlinkage long sys_pidfd_send_signal(int pidfd, int sig,
siginfo_t __user *info,
unsigned int flags);
asmlinkage long sys_pidfd_getfd(int pidfd, int fd, unsigned int flags);
+asmlinkage long sys_memfd_secret(unsigned long flags);
/*
* Architecture-specific system calls
diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
index ce58cff99b66..7ac0732dbaa4 100644
--- a/include/uapi/asm-generic/unistd.h
+++ b/include/uapi/asm-generic/unistd.h
@@ -863,9 +863,13 @@ __SYSCALL(__NR_process_madvise, sys_process_madvise)
__SC_COMP(__NR_epoll_pwait2, sys_epoll_pwait2, compat_sys_epoll_pwait2)
#define __NR_mount_setattr 442
__SYSCALL(__NR_mount_setattr, sys_mount_setattr)
+#ifdef __ARCH_WANT_MEMFD_SECRET
+#define __NR_memfd_secret 443
+__SYSCALL(__NR_memfd_secret, sys_memfd_secret)
+#endif
#undef __NR_syscalls
-#define __NR_syscalls 443
+#define __NR_syscalls 444
/*
* 32 bit systems traditionally used different
diff --git a/scripts/checksyscalls.sh b/scripts/checksyscalls.sh
index a18b47695f55..b7609958ee36 100755
--- a/scripts/checksyscalls.sh
+++ b/scripts/checksyscalls.sh
@@ -40,6 +40,10 @@ cat << EOF
#define __IGNORE_setrlimit /* setrlimit */
#endif
+#ifndef __ARCH_WANT_MEMFD_SECRET
+#define __IGNORE_memfd_secret
+#endif
+
/* Missing flags argument */
#define __IGNORE_renameat /* renameat2 */
--
2.28.0
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